红外夜视镜在美国对伊拉克反美武装力量实施的夜间打击中起到重要作用，红外夜视镜是利用了( )_刷题宝

题干

红外夜视镜在美国对伊拉克反美武装力量实施的夜间打击中起到重要作用，红外夜视镜是利用了( )

A：红外线波长长，易绕过障碍物的特点

B：红外线的热效应强的特点

C：一切物体都在不停地辐射红外线的特点

D：红外线不可见的特点

上一题下一题 0.0难度选择题更新时间:2014-07-09 02:46:09

答案(点此获取答案解析）

C

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《西游记》中“唐僧”的人物原型是（）

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求下列各图中F、s（不考虑动滑轮重及摩擦）

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填上“＞”“＜”或“=”．

34×0.25____34

1.24×1____1.24

1.56×1.5____1.56

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小明口渴时用塑料管把饮料吸到嘴里，对于这种现象说法不对的是( )

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补全短文。请阅读下面的对话, 并根据对话的内容, 将下面文本框中的文段大意补充完整。（提示：每空限填一词。）

Julie: Look! The elephants are eating grass. They are so big.

Susan: They are big and friendly to people.

Julie: There are giraffes over there.

Susan: What are they doing?

Julie: They are playing with the elephants.

Susan: Do you like giraffes?

Julie: Yes, I do. They are very cute.

Susan: Are the koalas there sleeping?

Julie: Yes, they are. They usually sleep during the day.

Susan: Is the lion eating there?

Julie: No, it isn't. It's relaxing. It relaxes for 20 hours every day.

The elephants like eating ____. Julie likes giraffes because they are ____. They are ____ with the elephants. Koalas don't often ____ at night. The lion relaxes for 140 hours a ____.

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